it's expected that jimmy carter, bush the elder, bush the younger, bill clinton and president obama will pay to south africa to pay their respects, to the extent that their health allows it. the scale of the memorial and burial is expected to match those of pope john paul, winston churchill and people of that magnitude. ran rather said he should be considered the greatest leader of the second half of the 21st century, that is how he's viewed around the world. his sature is something that few people have known. as the details emerge, we will bring them to you right here. now it's time for "the last word with lawrence o'donnell." >>> nelson mandela told his biographer, men come and go. i have come and i will go when my time comes. nelson mandela's time came today. >> i pledge to you with all my strength and ability to live up to your expectations. i am your servant. i don't come to you as